M1, Book 1: Mesmerizing Red, Enthralling Blue

FemNagisa! OOCKarma! Karma'll be nicer than usual, although only to Nagisa and only when alone. Also could be a damn sappy story judging by the description. ;D
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It was the beginning of school year I asked. "Koro-sensei, what are friends?" I asked. I was simply alone until a certain devil stalked me publically whereever I went. "You could say friends are four-leaved clovers." Koro-sensei began another 'friendship speech'... Might as well listen. "If you lose one, you lose luck. Your luck turns zero if you have no clovers left, and you'll never find another clover yet again. Probably." He added. How considerate of a moon-destroying octopus...
------------------------------------------------------------------------------------------------------------------------"Don't worry Nagisa, I'm here for you. Didn't you remember that I promised?" He eased my anxiety a bit, ending with a hearty laugh.
-------------------------------------------------------------------------------------------------------------------------"You ungrateful crap! You listen to your mother! Stop trying to be a tomboy, and after all the work I've done to get your beautiful hair!"
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"Nagisa, I'm sorry. But if I still have your permission to be with you, stay by your side, to never leave you alo --" I cut him off, my wounded hands grabbing him as I cried into the back of his jacket. "Don't leave me... Stay, please..."
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"Karma, where are you going for high school?" I asked him, curious of his probably life-changing destiny. He smiled, not his devious one, but a genuine one. "I'm going to your school, airhead. Did you forget our promise?"